EP4102752B1 - Method and apparatus for transmitting and receiving radio signals in a wireless communication system - Google Patents

Method and apparatus for transmitting and receiving radio signals in a wireless communication system

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Publication number
EP4102752B1
EP4102752B1 EP22187551.1A EP22187551A EP4102752B1 EP 4102752 B1 EP4102752 B1 EP 4102752B1 EP 22187551 A EP22187551 A EP 22187551A EP 4102752 B1 EP4102752 B1 EP 4102752B1
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EP
European Patent Office
Prior art keywords
cbg
cbgs
cbs
harq
case
Prior art date
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EP22187551.1A
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German (de)
English (en)
French (fr)
Other versions
EP4102752A1 (en
EP4102752C0 (en
Inventor
Suckchel Yang
Kijun Kim
Seonwook Kim
Changhwan Park
Joonkui Ahn
Hanjun Park
Seunggye Hwang
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LG Electronics Inc
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LG Electronics Inc
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Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to EP25185315.6A priority Critical patent/EP4604432A3/en
Priority claimed from PCT/KR2018/002743 external-priority patent/WO2018164495A1/ko
Publication of EP4102752A1 publication Critical patent/EP4102752A1/en
Application granted granted Critical
Publication of EP4102752B1 publication Critical patent/EP4102752B1/en
Publication of EP4102752C0 publication Critical patent/EP4102752C0/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/22—Negotiating communication rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present invention relates to a wireless communication system, and more specifically, to methods and devices for transmitting/receiving signals.
  • the wireless communication system can support carrier aggregation (CA).
  • CA carrier aggregation
  • Wireless communication systems have been widely used to provide various kinds of communication services such as voice or data services.
  • a wireless communication system is a multiple access system that can communicate with multiple users by sharing available system resources (bandwidth, transmission (Tx) power, and the like).
  • multiple access systems can be used. For example, a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Single Carrier Frequency-Division Multiple Access (SC-FDMA) system, and the like.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency-Division Multiple Access
  • R1-1702655 discloses 1-bit of HARQ-ACK per 1 CBG for CBG-based retransmission.
  • Related document D2 (3GPP contribution No. R1-1702990) discloses CBG-based retransmission of a TB for which Multi-HARQ-ACK feedback is used for a single TB.
  • One object of the present invention is directed to provide a method of performing a radio signal transceiving process efficiently and apparatus therefor.
  • radio signals can be efficiently transceived in a wireless communication system.
  • CDMA can be implemented by wireless communication technologies, such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA can be implemented by wireless communication technologies, for example, a Global System for Mobile communications (GSM), a General Packet Radio Service (GPRS), an Enhanced Data rates for GSM Evolution (EDGE), etc.
  • OFDMA can be implemented by wireless communication technologies, for example, IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, E-UTRA (Evolved UTRA), and the like.
  • UTRA is a part of a Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of an Evolved UMTS (E-UMTS) that uses an E-UTRA.
  • LTE-A LTE-Advanced
  • LTE-A is an evolved version of 3GPP LTE.
  • a UE receives information in downlink (DL) from a BS (base station), and the UE sends information in uplink (UL) to the BS.
  • Information transceived between the BS and the UE include data and various control informations, and various physical channels exist according to a type/usage of the information transceived by them.
  • FIG. 1 illustrates physical channels used in a 3GPP LTE/LTE-A system and a signal transmission method using the same.
  • the UE When powered on or when a UE initially enters a cell, the UE performs initial cell search involving synchronization with a BS in step S101. For initial cell search, the UE synchronizes with the BS and acquire information such as a cell Identifier (ID) by receiving a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the BS. Then the UE may receive broadcast information from the cell on a physical broadcast channel (PBCH). In the meantime, the UE may check a downlink channel status by receiving a downlink reference signal (DL RS) during initial cell search.
  • ID cell Identifier
  • P-SCH primary synchronization channel
  • S-SCH secondary synchronization channel
  • PBCH physical broadcast channel
  • the UE may check a downlink channel status by receiving a downlink reference signal (DL RS) during initial cell search.
  • DL RS downlink reference signal
  • the UE may acquire more specific system information by receiving a physical downlink control channel (PDCCH) and receiving a physical downlink shared channel (PDSCH) based on information of the PDCCH in step S102.
  • a physical downlink control channel (PDCCH)
  • PDSCH physical downlink shared channel
  • the UCI While the UCI is transmitted through a PUCCH in general, it may be transmitted through a PUSCH when control information and traffic data need to be simultaneously transmitted.
  • the UCI may be aperiodically transmitted through a PUSCH at the request/instruction of a network.
  • FIG. 2 illustrates a radio frame structure.
  • uplink/downlink data packet transmission is performed on a subframe-by-subframe basis.
  • a subframe is defined as a predetermined time interval including a plurality of OFDM symbols.
  • 3GPP LTE supports a type-1 radio frame structure applicable to FDD (Frequency Division Duplex) and a type-2 radio frame structure applicable to TDD (Time Division Duplex).
  • Table 1 shows subframe configurations in a radio frame according to UL-DL configuration.
  • Uplink-downlink configuration Downlink-to-Uplink Switch point periodicity
  • Subframe number 0 1 2 3 4 5 6 7 8 9 0 5ms D S U U U D S U U U 1 5ms D S U U D D S U U D 2 5ms D S U D D D S U D D 3 10ms D S U U U D D D D D D 4 10ms D S U U D D D D D D 5 10ms D S U D D D D D D D 6 5ms D S U U U U D S U U D S U U D S U U D
  • FIG. 4 illustrates a downlink subframe structure
  • the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
  • the CCE is a logical allocation unit used to provide the PDCCH with a coding rate based on a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • a format of the PDCCH and the number of bits of the available PDCCH are determined by the number of CCEs.
  • the BS determines a PDCCH format according to DCI to be transmitted to the UE, and attaches a cyclic redundancy check (CRC) to control information.
  • CRC cyclic redundancy check
  • the CRC is masked with a unique identifier (referred to as a radio network temporary identifier (RNTI)) according to an owner or usage of the PDCCH.
  • RNTI radio network temporary identifier
  • a unique identifier e.g., cell-RNTI (C-RNTI)
  • C-RNTI cell-RNTI
  • P-RNTI paging-RNTI
  • REG is used as a basic resource unit of a control region.
  • 4 PDCCH formats are supported as shown in Table 2.
  • Table 2 PDCCH format Number of CCEs (n) Number of REGs Number of PDCCH bits 0 1 9 72 1 2 8 144 2 4 36 288 3 5 72 576
  • the BS may not find CCE resources on which PDCCHs will be transmitted to available UEs within given subframes. To minimize the possibility that this blocking continues to the next subframe, a UE-specific hopping sequence is applied to the starting point of the USS.
  • Table 3 shows sizes of the CSS and USS.
  • PDCCH format Number of CCEs (n) Number of candidates in common search space Number of candidates in dedicated search space 0 1 - 6 1 2 - 6 2 4 4 2 3 8 2 2
  • Formats 3 and 3A have the same size as that of formats 0 and 1A and may be discriminated from each other by scrambling CRC with different (common) identifiers rather than a UE-specific identifier.
  • PDSCH transmission schemes and information content of DCI formats according to transmission mode (TM) are arranged below.
  • a PDCCH (for convenience, legacy PDCCH or L-PDCCH) according to legacy LTE may be allocated to a control region (see FIG. 4 ) of a subframe.
  • the L-PDCCH region means a region to which a legacy PDCCH may be allocated.
  • a PDCCH may be further allocated to the data region (e.g., a resource region for a PDSCH).
  • a PDCCH allocated to the data region is referred to as an E-PDCCH.
  • control channel resources may be further acquired via the E-PDCCH to mitigate a scheduling restriction due to restricted control channel resources of the L-PDCCH region.
  • the E-PDCCH carries DCI.
  • the E-PDCCH may carry downlink scheduling information and uplink scheduling information.
  • the UE may receive the E-PDCCH and receive data/control information via a PDSCH corresponding to the E-PDCCH.
  • the UE may receive the E-PDCCH and transmit data/control information via a PUSCH corresponding to the E-PDCCH.
  • the E-PDCCH/PDSCH may be allocated starting from a first OFDM symbol of the subframe, according to cell type.
  • the PDCCH includes both L-PDCCH and EPDCCH unless otherwise noted.
  • FIG. 6 illustrates an uplink subframe structure used in LTE(-A)
  • a subframe 500 includes two 0.5ms slots 501.
  • each slot includes 7 symbols 502 each corresponding to an SC-FDMA symbol.
  • a resource block 503 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and to a slot in the time domain.
  • the uplink subframe structure of LTE(-A) is divided into a data region 504 and a control region 505.
  • the data region refers to a communication resource used for a UE to transmit data such as audio data, packets, etc., and includes a PUSCH (physical uplink shared channel).
  • the control region means a communication resource used in sending a UL control signal (e.g., a DL channel quality report from ach UE, ACK/NACK of reception for a DL signal, a UL scheduling request, etc.), and includes PUCCH (Physical Uplink Control Channel).
  • a sounding reference signal (SRS) is transmitted through SC-FDMA symbol located at the last on a time axis in a single subframe. Several UEs' SRSs transmitted by last SC-FDMA of the same frame can be sorted according to a frequency location/sequence.
  • SRS is used to send UL channel state to the BS.
  • the STS may be periodically transmitted according to a subframe period/offset configured by an upper layer (e.g., RRC layer), or aperiodically transmitted in response to a BS's request.
  • FIG. 5 illustrates SC-FDMA and OFDMA schemes.
  • the 3GPP system employs OFDMA in downlink and uses SC-FDMA in uplink.
  • HARQ Hybrid Automatic Repeat reQuest
  • a BS selects a UE to transmit data thereto in each TTI (transmission time interval) (e.g., subframe).
  • TTI transmission time interval
  • a BS selects UEs to transmit data in UL/DL link and also selects a frequency band used for data transmission by the corresponding UE.
  • UEs transmit reference (or pilot) signals in UL and a BS selects UEs to transmit data in UL on a unit frequency band in each TTI by obtaining channel states of the UEs using the reference signals transmitted by the UEs.
  • the BS informs the UE of such a result. Namely, the BS sends a UL assignment message indicating to send data using a specific frequency band to a UE UL-scheduled in specific TTI.
  • the UL assignment message may be referred to as a UL grant.
  • the UE transmits data in UL according to the UL assignment message.
  • the UL assignment message may include UE ID (UE Identity), RB allocation information, MCS (Modulation and Coding Scheme), RV (Redundancy Version), New Data Indication (NDI), etc.
  • a retransmission time is promised systematically (e.g., after 4 subframes from an NACK received time) (synchronous HARQ).
  • a UE grant message sent to a UE by a BS is just sent in case of an initial transmission. Thereafter, a retransmission is performed by an ACK/NACK signal (e.g., PHICH signal).
  • an ACK/NACK signal e.g., PHICH signal.
  • a BS since a retransmission time is not promised mutually, a BS should send a retransmission request message to a UE.
  • a frequency resource or MCS for retransmission is identical to that for a previous transmission.
  • FIG. 8 exemplarily shows a UL HARQ operation in LTE/LTE-A system.
  • UL HARQ uses synchronous non-adaptive HARQ.
  • HARQ process numbers are given as 0 ⁇ 7.
  • a single HARQ process operates in every TTI (e.g., subframe).
  • a BS 110 transmits a UL grant to a UE 120 through PDCCH [S600].
  • the UE 120 transmits UL data to the BS 110 using RB and MCS designated by a UL grant after 4 subframes from a timing (e.g., subframe 0) of receiving the UL grant [S602].
  • the BS 110 decodes the UL data received from the UE 120 and then generates ACK/NACK. If failing in decoding the UL data, the BS 110 transmits NACK to the UE 120 [S604]. The UE 120 retransmits UL data after 4 subframes from a timing of receiving the NACK [S606].
  • the same HARQ processor is responsible for the initial transmission and retransmission of the UL data (e.g., HARQ process 4).
  • ACK/NACK information may be transmitted through PHICH.
  • DL HARQ in the LTE/KTE-A system uses asynchronous adaptive HARQ.
  • the base station 110 sends a DL grant to the UE 120 through PDCCH.
  • the UE 120 receives DL data from the BS 110 using RB and MCS designated by the DL grant at a timing (e.g., subframe 0) of receiving the DL grant.
  • the UE 120 decodes the DL data and then generates ACK/NACK. If failing in decoding the DL data, the UE 120 sends NACK to the BS 110 after 4 subframes (e.g., subframe 4) from the timing of receiving the DL data.
  • the BS 110 sends a DL grant, which indicates a retransmission of DL data, to the UE 120 through PDCCH at a desired timing (e.g., subframe X).
  • the UE 120 receives DL data again from the BS 110 using the RC and MCS designated by the DL grant at the timing (e.g., subframe X) of receiving the DL grant.
  • a plurality of parallel HARQ processes exist in BS/UE.
  • a plurality of parallel the HARQ processes enable DL/UL transmissions to be consecutively performed while waiting for HARQ feedback of ACK or NACK for a previous DL/UL transmission.
  • Each of the HARQ processes is associated with an HARQ buffer of a MAC (medium access control) layer.
  • Each of the HARQ processes manages state variables for the transmission count of MAC PDU (physical data block) in a buffer, HARQ feedback for MAC PDU in a buffer, a current redundancy version, etc.
  • the HARQ process is responsible for reliable transport of data (e.g., transport block (TB)).
  • a transport block can be divided into at least one code block (CB) by considering a size of a channel encoder.
  • CB code block
  • CW codeword
  • FIG. 9 exemplarily shows a transport block (TB) processing process.
  • a process of FIG. 9 is applicable to data of DL-SCH, PCH and MCH (multicast channel) transport channel.
  • UL TB (or data of UL transport channel) can be processed similarly.
  • a transmitter applies a CRC (e.g., 24 bits) (TB CRC) for error check to a TB. Thereafter, the transmitter can segment (TB + CRC) into a plurality of code blocks by considering a size of a channel encoder.
  • a maximum size of a code block in LTE/LTE-A is 6144 bits. Hence, if a TB size is equal to or smaller than 6144 bits, a code block is not configured. If a TB size is greater than 6144 bits, a TB is segmented by 6144-bit unit to configure a plurality of code blocks.
  • a CRC e.g., 24 bits
  • CB CRV is individually attached to each of the code blocks for error check.
  • N IR bit indicates a soft buffer size for transport block
  • abd N cb indicates a soft buffer size for the r-th code block.
  • N IR N soft K C ⁇ K MIMO ⁇ min M DL _ HARQ , M limit
  • N soft indicates the total number of soft channel bits according to UE ability.
  • K MIMO is 2 if a UE is configured to receive PDSCH transmission based on a transmission mode 3, 4, 8 or 9. Otherwise, K MIMO is 1.
  • M DL_HARQ is the maximum number of DL HARQ processes.
  • 0M limit 8.
  • a UE In FDD and TDD, a UE is configured to have two or more serving cells. For at least K MIMO ⁇ min( M DL_HARQ , M limit ) transport blocks, if failing in the decoding of code blocks of the transport block, the UE stores the received soft channel bits corresponding to a range of w k w k +1 , ..., w mod( k + n SB -1, N cb ) at least.
  • n SB is given by the following formula.
  • n SB min N cb N soft ′ C ⁇ N cells DL ⁇ K MIMO ⁇ min M DL _ HARQ , M limit ,
  • M DL_HARQ is the maximum number of DL HARQ processes.
  • N cells DL is the number of the configured serving cells.
  • N soft ′ is the total number of soft channel bits according to UE ability.
  • a UE When k is determined, a UE prioritizes the storage of soft channel bits corresponding to k of low values.
  • w k corresponds to the received soft channel bits.
  • the range w k w k +1 ,..., w mod( k+n SB -1, N cb ) may include a subset failing to be included in the received soft channel bits.
  • a user equipment receives information on a random access from a base station via system information. Thereafter, if the random access is required, the user equipment transmits a random access preamble (or a message 1) to the base station (S710). Once the base station receives the random access preamble from the user equipment, the base station sends a random access response message (or, a message 2) to the user equipment (S720).
  • a DL scheduling information on the random access response message may be transmitted on L1/L2 control channel (PDCCH) by being CRC masked with RA-RNTI (random access-RNTI).
  • the DCI format 1A may be used for a random access procedure according to a PDCCH order.
  • a PDCCH for downlink allocation can be transmitted on DL CC #0 and a PDSCH corresponding thereto can be transmitted on DL CC #2.
  • component carrier may be replaced by other equivalent terms (e.g. "carrier”, "cell”, etc.).
  • FIG. 13 illustrates scheduling when a plurality of carriers is aggregated. It is assumed that 3 DL CCs are aggregated and DL CC A is set to a PDCCH monitoring DL CC.
  • DL CC A, DL CC B and DL CC C can be called serving CCs, serving carriers, serving cells, etc.
  • a DL CC can transmit only a PDCCH that schedules a PDSCH corresponding to the DL CC without a CIF (non-cross-CC scheduling).
  • a TXRU transmitter unit
  • independent beamforming can be performed per frequency resource. Yet, it is ineffective to install TXRU at each of 100 antenna elements in aspect of price.
  • a method of mapping a multitude of antenna elements to a single TXRU and adjusting a direction of a beam is taken into consideration. Since such an analog beamforming scheme can make a single beam direction only on full bands, it is disadvantageous in that a frequency selective beam cannot be provided. It is able to consider hybrid BF, which has B TXRUs smaller than Q antenna elements, in an intermediate form between digital BF and analog BF. In this case, although there are differences depending on a scheme of connection between the B TXRUs and the Q antenna elements, the number of directions of simultaneously transmittable beams is limitedly equal to or smaller than B..
  • PDFICH, PHICH and PDCCH can be transmitted.
  • PDSCH can be transmitted.
  • a GP provides a time gap in a process for a BS and UE to switch to an Rx mode from a Tx mode, and vice versa. Some OFDM symbols of a timing of switching to UL from DL in a subframe may be set as a GP.
  • a size (i.e., TBS) of DL data becomes equal to or greater than a predetermined level
  • a bitstream (i.e., TB) to be transmitted on PDSCH is partitioned into a plurality of CBs and channel coding and CRC are applied per CB [cf. FIG. 9 ].
  • a UE If failing in receiving (i.e., decoding) any one of a plurality of CBs included in a single TB, a UE reports HARQ-ACK feedback (e.g., NACK) corresponding to the TB to a BS. Through this, a BS retransmits all CBs corresponding to the TB.
  • HARQ-ACK feedback e.g., NACK
  • an HARQ operation for DL data in the existing LTE/LTE-A is performed based on scheduling/transmission in unit of TB from the BS and HARQ-ACK feedback configuration in unit of TB, which corresponds to the scheduling/transmission from the UE.
  • a next generation RAT (hereinafter, a new RAT) system can basically have a system (carrier) BW (bandwidth) wider than that of LTE, whereby it is highly probable that TBS (or, maximum TBS) becomes greater than that of LTE.
  • TBS or, maximum TBS
  • the number of CBs configuring a single TB may become greater than that of LTE.
  • decoding error i.e., NACK
  • retransmission scheduling is accompanied in unit of TB.
  • resource use efficiency may be lowered.
  • a delay-insensitive data type 1 e.g., enhanced mobile broadband (eMBB)
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low latency communications
  • NACK decoding error
  • the present invention proposes a method of performing (retransmission) scheduling in unit of CB or CBG (CB group) and configuring/transmitting HARQ-ACK feedback in unit of CB/CBG, in consideration of properties of a new RAT system.
  • the present invention proposes a method of configuring CBG, a method of configuring HARQ-ACK (hereinafter abbreviated A/N) feedback, a method of operating a reception soft buffer of a UE, a method of handling a specific mismatch situation, and the like.
  • the bit number Cn configuring a single CB may be predefined as a single same value irrespective of TBS or different values per TBS (e.g., values proportional to TBS), or indicated to a UE through semi-static signaling (e.g., RRC signaling) or dynamic signaling (e.g., DCI).
  • semi-static signaling e.g., RRC signaling
  • dynamic signaling e.g., DCI.
  • one CB may be configured with (Cn + mod(Ck, Cn)) bits, and each of the rest of (Cm - 1) CBs may be configured with Cn bits.
  • one CB may be configured with mod(Ck, Cn) bits, and each of the rest of (Cm - 1) CBs may be configured with Cn bits.
  • Cn may mean a minimum bit number configuring one CB.
  • Cn may mean a maximum bit number configuring one CB.
  • Cn may mean a minimum bit number configuring one CB.
  • Cn may mean a maximum bit number configuring one CB.
  • a small CB among total Cm CBs can be configured with the small number of bits less than the rest of other CBs (hereinafter, regular CB).
  • regular CB the rest of other CBs
  • a scheme of grouping Cm CBs having unequal sizes into a plurality of CBGs may be necessary.
  • the total CB number 'Cm' becomes a multiple of the CBG number 'M'
  • the total CB number 'Cm' does not become a multiple of the CBG number 'M'.
  • the following CB grouping schemes can be considered.
  • Cm 7
  • M 3) CBG configurations.
  • CB indexes ⁇ 1, 2 ⁇ , ⁇ 3, 4 ⁇ , and ⁇ 5, 6, 7 ⁇ can be configured with CBG indexes 1/2/3, respectively.
  • CB indexes ⁇ 1, 2, 3 ⁇ , ⁇ 4, 5 ⁇ , and ⁇ 6, 7 ⁇ can be configured with CBG indexes 1/2/3, respectively.
  • CB indexes ⁇ 1, 2, 5 ⁇ , ⁇ 3, 6 ⁇ , and ⁇ 4, 7 ⁇ can be configured with CBG indexes 1/2/3, respectively.
  • CB indexes ⁇ 1, 2 ⁇ , ⁇ 3, 4 ⁇ , and ⁇ 5, 6, 7 ⁇ can be configured with CBG indexes 1/2/3, respectively.
  • the total CB number 'Cm' may be predefined as the same single value irrespective of TBS or values different per TBS (e.g., values proportional to TBS), or indicated to a UE through semi-static signaling (e.g., RRC signaling) or dynamic signaling (e.g., DCI).
  • Cn ceiling(Ck / Cm) bits.
  • only one CB can be configured with (Cn + mod(Ck, Cn)) bits and each of the rest of (Cm - 1) CBs can be configured with Cn bits.
  • Cn may mean the minimum bit number configuring one CB.
  • Cn may mean the maximum bit number configuring one CB.
  • mod(Ck, Cm) CBs are configured with (Cn + 1) (or, ceiling(Ck / Cm)) bits and the rest of (Cm - mod(Ck, Cm)) CBs can be configured with Cn bits.
  • Method X-3 If the minimum bit number 'Tm' configuring one CB is given, CB is configured based on Tm.
  • Every CB configuring one TB may be set to be configured with at least Tm bits. For example, if TBS is assumed with Ck, a maximum Cm value 'Cm.max' meeting the relation 'Ck / Cm ⁇ Tm' is calculated and an operation of segmenting the corresponding TB into Cm.max CBs can be considered.
  • Method X-4 If the CB number is equal to or greater than a specific level, CB-unit scheduling and grouping between plural CBs are performed.
  • CB- or CBG-unit (retransmission) scheduling can be set/defined to be applied to the corresponding TB.
  • a plurality of CBs can be set/defined to be grouped to configure one CBG (e.g., Ts ⁇ Tg).
  • the bit number Cn configuring one CB may be predefined or given through specific signaling (e.g., RRC signaling, DCI).
  • Method A-1 If the CB number 'N' configuring a single CBG is given, M CBGs are configured based on the CB number 'N'.
  • the CB number 'N' configuring a single CB may be predefined as a single same value irrespective of TBS or different values per TBS (e.g., values proportional to TBS), or indicated to a UE through semi-static signaling (e.g., RRC signaling) or dynamic signaling (e.g., DCI).
  • semi-static signaling e.g., RRC signaling
  • dynamic signaling e.g., DCI.
  • one CBG may be configured with (N + mod(K, N)) CBs, and each of the rest of (M - 1) CBGs may be configured with N CBs.
  • one CBG may be configured with mod(K, N) CBs, and each of the rest of (M - 1) CBGs may be configured with N CBs.
  • N may mean a minimum CB number configuring one CBG.
  • N may mean a maximum CB number configuring one CBG.
  • a UE can configure and transmit A/N bit per CBG.
  • N may mean a minimum CB number configuring one CBG.
  • N may mean a maximum CB number configuring one CBG
  • Method A-2 If the total CBG number 'M' is given, each CBG is configured in a unit of N-CBs based on M.
  • the total CBG number 'M' may be predefined as the same single value irrespective of TBS or as a different value per TBS (e.g., a value proportional to TBS), or indicated to a UE through semi-static signaling (e.g., RRC signaling) or dynamic signaling (e.g., DCI).
  • N may mean the minimum CB number configuring one CBG.
  • N may mean the maximum CB number configuring one CBG.
  • a UE can configure and transmit M A/N bits for a TB, and each of the A/N bits may indicate an A/N result for a corresponding CBG.
  • a UE can receive information on the number M of code block groups per transport block through upper layer signaling (e.g., RRC signaling) from a BS [S1602]. Thereafter, the UE can receive initial transmission of data from the BS (on PDSCH) [S1604].
  • the data include a transport block, the transport block includes a plurality of code blocks, and a plurality of the code blocks can be grouped into one or more code block groups.
  • some of the code block groups may include ceiling (K / M) code blocks and the rest of code block groups may include flooring (K / M) code blocks.
  • K indicates the number of code blocks in the data.
  • Method A-3 CBG configuration based on a tree (or nested) structure for the CBG number 'M' and the CBG size 'N'
  • CBG can be configured to have a tree structure for the total CBG number 'M' (e.g., M1, M2 ...) and the CBG size 'N' (e.g., N1, N2 ).
  • a plurality of different CBG configurations based on a plurality of different (M, N) combinations can be set for one TB (size).
  • CBG configuration in case of (M1, N1) and CBG configuration in case of (M2, N2) for the different (M, N) combinations if M1 ⁇ M2, it is able to set N1 > N2.
  • one CBG in case of (M1, N1) can be configured to include at least one CBG in case of (M2, N2).
  • one CBG in case of (M2, N2) can be configured to belong to a specific CBG in case of (M1, N1) only.
  • M2 may be set to a multiple of M1 or/and N1 may be set to a multiple of N2.
  • an index for M, N or (M, N) combination or one (or more) of CBG indexes available with reference to all (M, N) combinations can be indicated to the UE through semi-static signaling (e.g., RRC signaling) or dynamic signaling (e.g., DCI).
  • the UE can configure and transmit A/N bits per CBG configured to correspond to the corresponding index.
  • M and N may be predefined as a same single value irrespective of TBS or predefined as values per TBS (e.g., values proportional to TBS).
  • a CBG index available with reference to all (M, N) combinations can be indicated to a UE.
  • the UE can perform the decoding and the corresponding A/N feedback configuration/transmission in a state that CBG configuration corresponding to the M and/or N index for the scheduled DL data (e.g., TB or CBG).
  • the total CBG index number L configured in the nested form may be set equal per TBS or a per-TBS L value may be set to enable a bit overhead for CBG indication to be equal per TBS (i.e., to enable a value of ceiling(log 2 (L)) to be set equal).
  • CBs transmitted through each SG (and/or each RBG) may be configured as one CBG.
  • information on the symbol number in each SG or the symbol number configuring a single SG (and/or the RB number in each RBG or the RB number configuring a single RBG) may be indicated to a UE through semi-static signaling (e.g., RRC signaling) or dynamic signaling (e.g., DVI).
  • the UE can configure and transmit A/N bit per CBG.
  • a scheme of configuring CBG to have the tree structure like the method A-3 for the symbol number configuring one SG or the total SG number configured within a TB transmission time interval (and/or the RB number configuring one RBG or the total RBG number configured within a TB transmission frequency region) is possible as well.
  • a plurality of SGs (or RBGs) mutually having the nested structure relation can be configured in form similar to the nested CBG example 1/2/3.
  • the SG (and/or RBG) size/number may be predefined as a same single value irrespective of TBS, or predefined as values different per TB (e.g., values proportional to TBS).
  • the corresponding CB may be defined as: Opt 1) included in CBG corresponding to SG having a lowest or highest symbol index (and/or RBG having a lowest or highest RB index); or Opt 2) as included in CBG corresponding to SG (and/or RBG) including the coded bits of the corresponding CB as many as possible.
  • the corresponding CB can operate to be transmitted once only.
  • the corresponding CB may be transmitted in a manner of being included in a specific one (based on Opt 1/2 application) of a plurality of the corresponding CBGs.
  • the proposed scheme is applicable.
  • some CBGs among the M CBGs may be set to include a specific CB in common.
  • two random CBGs in a set of CBGs of which number is smaller than M may include one CB in common, and the number of CBs included in the two random CBGs may be total (M - mod(K, M)).
  • a scheduled TBS is A bits and that the SG or RBG (generalized as CBG) number allocated to the corresponding TBS is M, (A / M) data bits, ceiling(A / M) data bits, or floor(A / M) data bits can be allocated.
  • the per-SG symbol number can be configured in proportion to the symbol number allocated to data transmission.
  • the per-SG symbol number can be configured in inverse proportion to the RB number (or the TBS number) allocated to data transmission.
  • a scheme of changing the RB number configuring one RBG according to the RB number allocated to data transmission and/or the symbol (or TBS) number allocated thereto is possible.
  • the per-RBG RB number can be configured in proportion to the RB number allocated to data transmission.
  • the per-RBG RB number can be configured in inverse proportion to the RB number (or the TBS number) allocated to data transmission.
  • a TBS-CBG table As an additional method, first of all, if a set of (M, N) sets to be applied per TBS is named a TBS-CBG table, it is able to consider a scheme of indicating one of a plurality of TBS-CBG tables to a UE through semi-static signaling (e.g., RRC signaling) or dynamic signaling (e.g., DCI) in a state that a plurality of the TBS-CBG tables are predefined/preset.
  • the (M, N) combination corresponding to the same TBS may be configured differently between a plurality of the TBS-CBG tables.
  • M, N and K may be set/indicated as the same value for each of different TBSs or different values for different TBSs, or set/indicated as the same value for a portion (e.g., N) according to TBS or different values for the rest (e.g., M and K).
  • one symbol group (SG) can be configured/set based on a slot in the foregoing proposed method (in this case, a symbol index is applied by being substituted with a slot index).
  • a UE can operate in a manner of selecting a specific CBG configuration, determining a CBG index including all NACKs based on the selected CBG configuration, and then feeding back the NACK CBG index and the selected CBG configuration information to a BS.
  • the NACK CBG is preferably selected as one CBG having a minimum size by including all NACKs.
  • a UE may configure and feed back A/N bit per CBG and operate to feedback NACK for a corresponding CBG (irrespective of a presence or non-presence of scheduling of the corresponding CBG) until succeeding in decoding of each CBG. And, the UE may operate to feed back ACK for the corresponding CBG from a timing of success in the decoding (irrespective of a presence or non-presence of scheduling of the corresponding CBG and until termination of a corresponding HARQ process).
  • FIG. 17 exemplarily shows a signal transmitting process for the present invention.
  • FIG. 17 assumes a situation of setting the number of CBGs per TB to 3 and (re)transmitting TB for the same HARQ process (i.e., Assume an operation before termination of an HARQ process corresponding to TB).
  • a UE can receive CBG #0 and CBG #2 for TB (e.g., HARQ process #a) from a BS [S1702].
  • the TB of the step S1702 may include an initial transmission or a retransmission corresponding to the HARQ process #a.
  • CBG #1 is assumed as never succeeding in decoding formerly.
  • the UE transmits A/N information corresponding to 3 CBGs to the BS [S1704], sets A/N information on CBG #1 to NACK, and sets A/N information on each of CBG #0 and CBG #2 to ACK or NACK according to a decoding result.
  • the BS retransmits the TB (e.g., HARQ process #a) in unit of CBG, and the UE can receive CBG #1 and CBG #2 for the corresponding TB [S1706].
  • the UE transmits the A/N information corresponding to the 3 CBGs to the BS [S1708], sets the A/N information on CBG #0 to ACK because of the previously successful decoding of CBG #0, and sets the A/N information on each of CBG #1 and CBG #2 to ACK or NACK according to the decoding result.
  • L may be semi-fixed to a single value through semi-static signaling (e.g., RRC signaling), or dynamically changed through dynamic signaling (e.g., DL data scheduling DCI).
  • CBG indication signaling can be configured to enable CBG scheduling up to max L CBGs among total M CBGs through scheduling DCI of CBG unit.
  • retransmission scheduling from a BS
  • L or less CBGs among total M CBGs configuring TB can be performed, where L ⁇ M.
  • a BS/UE can perform scheduling(DCI transmission)/A/N feedback of TB unit.
  • an A/N payload size (e.g., M bits) is set with reference to TB-unit (re)transmission.
  • CBs belonging to total L scheduled CBGs (each of which is configured with N CBs) are reconfigured into M CBGs (each of which is configured with CBs less than N).
  • the total A/N feedback according to A/N bit allocation of CBG unit can be configured.
  • a BS can perform retransmission scheduling by assuming that M CBGs corresponding to A/N feedback correspond to a total CBG set.
  • a corresponding signaling can be configured in form of: 1) retransmission CBG indication with reference to the total CBG number 'M' irrespective of A/N payload size change; or 2) CBG indication in a state that a CBG set (equal to or smaller than M) fed back as NACK by the UE is assumed as the total CBG configuration.
  • a BS can operate to configure total CBG configuration with Mr CBGs (Mr ⁇ M), and indicate retransmission of L CBGs among the Mr CBGs to a UE (L ⁇ Mr).
  • M has a fixed value during at least one TB transmission or one HARQ process, but Mr (and L) may be changed every (retransmission) scheduling timing.
  • A/N feedback can be configured based on the total CBG number 'Mr' at a scheduling timing.
  • the total A/N payload size is configured with Mr bits, and (Mr - L) bits corresponding to CBG failing to be scheduled actually may be processed as NACK or DTX.
  • A/N feedback can be configured based on the scheduled CBG number 'L'. For example, by configuring the total A/N payload size with L bits, A/N bit can be mapped/transmitted per scheduled CBG.
  • total Mr CBG configurations for retransmission scheduling in the BS may be configured for the total CB set configuring TB (i.e., the total CB set is equal to the total TB) or by being limited to a specific portion of the total CBs (i.e., the total CBG set corresponds to a portion of TB).
  • an Mr value at a specific scheduling timing for one TB transmission or one HARQ process may be limited to be set to a value always smaller than or equal to an Mr value at a previous scheduling timing.
  • TX timing 1 an original TB transmission timing
  • TX timing 2 a subsequent CBG transmission timing
  • the UE can transmit a signal, which remains after excluding CBG corresponding to the subsequent CBG from the scheduled original TB signal (e.g., puncturing the CBG mapped RE/RB/symbol), only through TX timing 1, and also transmit the retransmission-scheduled subsequent CBG intactly through TX timing 2.
  • a signal which remains after excluding CBG corresponding to the subsequent CBG from the scheduled original TB signal (e.g., puncturing the CBG mapped RE/RB/symbol), only through TX timing 1, and also transmit the retransmission-scheduled subsequent CBG intactly through TX timing 2.
  • Cn applied to one HARQ process or one TB transmission can be determined: 1) with reference to initial A/N feedback (CBG of NACK therein) configured by CBG unit only (i.e., Cn is uniformly applied until HARQ process termination); or 2) with reference to A/N feedback (CBG of NACK therein) at each of A/N transmission timings (i.e., Cn is determined according to NACK CBG at each scheduling/feedback timing).
  • Rx CRC check results (e.g., pass/fail) at a UE may appear differently.
  • the CRC check result is 'pass', it means that a corresponding data block is successfully/correctly detected. If the CRC check result is 'fail', it means that a corresponding data block is not successfully/correctly detected.
  • CRC check result(s) in unit of CB and/or CBG may be 'pass' all (i.e., a CB CRC based CRC check is pass) but a CRC check result of the whole TB may be 'fail' (i.e., a TB CRC based CRC check is fail).
  • at least one of CRC check results in unit of CB and/or CBG is fail (i.e., a CB CRC based CRC check is fail) but a CRC check result of the whole TB may be pass (i.e., a TB CRC based CRC check is pass).
  • the UE can apply one of Opt 3 to Opt 5 of Method D-1.
  • Opt 3 to Opt 5 of Method D-1 are listed as follows.
  • an RV field in (retransmission) scheduling DCI of CBG unit 1) one RV field is configured in the same size of an RV field of scheduling DCI of TB unit and an indicated RV value is uniformly applied to the scheduled whole CBG (here, the branch number of the RV value can be configured equal to the case of TB-unit scheduling), or 2) an individual RV field is configured per CBG but can be configured to have a size smaller than that of an RV field of TB-unit scheduling DCI (yet, the branch number of the RV value can be configured smaller than the case of the TB-unit scheduling).
  • NDI filed can be interpreted differently according to a (re)transmission for the whole TB or a retransmission for some CBGs (among all CBGs configuring TB).
  • an NDI bit toggled combination is recognized as scheduling for new data transmission as soon as it is indicated through DCI that all CBGs configuring TB are transmitted.
  • a case of indicating through DCI that some of all CBGs are transmitted may be regarded as retransmission (not new data), and the NDI field can be used for another specific usage.
  • an indicator indicating a transmission for the whole TB or a transmission for some CBGs through DCI can be signaled directly.
  • an NDI bit toggled combination can be recognized as scheduling of new data transmission as soon as the whole TB transmission is indicated.
  • the latter case i.e., some CBG transmission indication
  • the NDI field can be used for another specific usage.
  • the NDI field can indicate: 1) whether to save a received CBG signal to an Rx buffer corresponding to a corresponding CBG index by combining it with a previously saved signal or to newly save a received CBG signal only by emptying the buffer by flushing a previously saved signal (i.e., CBG buffer flush indicator, CBGFI), or 2) a (re)transmitted CBG (index) (i.e., CBG transmission indicator, CBGTI).
  • each bit configuring a CBGTI field can be used to individually indicate a presence or non-presence of (re)transmission for each CBG index. For example, bit '1' indicates that CBG (corresponding to the corresponding bit) is (re)transmitted, and bit '0' indicates that the corresponding CBG is not (re)transmitted. For example, bit '1' may indicate to flush a buffer (for a (re)transmission indicated CBG), and bit '0' may indicate not to flush the corresponding buffer.
  • CBG mode 1 In a state that CBGTI field is configured/set in DCI (without separate CBGFI field configuration) [hereinafter, CBG mode 1], all bits configuring the corresponding CBGTI field (without NDI toggling) can be indicated as '0'.
  • provided/regarded (by UE) is indicating (re)transmission for all CBGs configuring a given TB and a buffer flush operation for all CBGs both.
  • a UE is able to operate to save a newly received CBG signal to a buffer after flushing a signal previously saved to the buffer.
  • CBG mode 1 all bits configuring CBGTI field (in a state that NDI is not toggled) can be indicated as '1'.
  • provided/regarded (by UE) is indicating (re)transmission for all CBGs configuring a given TB in a state that a buffer flush operation is not indicated.
  • CBG mode 2 In a state that both CBGTI field and CBGFI field are configured/set in DCI [hereinafter, CBG mode 2], all bits configuring the CBGTI field (without NDI toggling) can be indicated as '0'. In this case, provided/regarded (by UE) is indicating (re)transmission for all CBGs configuring a given TB. In this state, additionally, if CBGFI bit is indicated as '0', it can be provided/regarded (by UE) that a buffer flush operation for specific some CBGs (hereinafter, CBG sub-group 1) is indicated [Case 1].
  • CBG sub-group 1 a buffer flush operation for specific some CBGs
  • FIG. 18 illustrates a BS, a relay and a UE applicable to the present invention.
  • a wireless communication system includes a BS 110 and a UE 120.
  • the wireless communication system includes a relay, the BS or UE may be replaced by the relay.
  • the BS includes a processor 112, a memory 114, an RF unit 116.
  • the processor 112 may be configured to implement the procedures and/or methods proposed by the present invention.
  • the memory 114 is connected to the processor 112 and stores information related to operations of the processor 112.
  • the RF unit 116 is connected to the processor 112, transmits and/or receives an RF signal.
  • the UE 120 includes a processor 122, a memory 124, and an RF unit 126.
  • the processor 112 may be configured to implement the procedures and/or methods proposed by the present invention.
  • the memory 124 is connected to the processor 122 and stores information related to operations of the processor 122.
  • the RF unit 126 is connected to the processor 122, transmits and/or receives an RF signal.
  • the embodiments of the present invention have been described based on data transmission and reception between a BS (or eNB) and a UE.
  • a specific operation which has been described as being performed by the BS may be performed by an upper node of the BS as the case may be.
  • various operations performed for communication with the UE in the network which includes a plurality of network nodes along with the BS may be performed by the BS or network nodes other than the BS.
  • the BS may be replaced with terms such as fixed station, Node B, eNode B (eNB), and access point.
  • the term UE may be replaced with terms such as UE (MS) and mobile subscriber station (MSS).
  • the present invention is applicable to a UE, BS or other devices of a wireless mobile communication system.

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EP22187551.1A 2017-03-08 2018-03-08 Method and apparatus for transmitting and receiving radio signals in a wireless communication system Active EP4102752B1 (en)

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EP19212163.0A EP3633896B1 (en) 2017-03-08 2018-03-08 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
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